Level 2 caching is turned on by default. This mode requires you to rebuild user-rank associations
via the Rebuild Cache panel after editing usergroup ranks.
1. ThreePointStudio_UsergroupRanks_Model_UsergroupRanks::invalidateCache (case 3) does not work as advertised. This method is not used in anywhere else except for upgrading so this does not affect users.
Support is given here and on 3.studIo Forums